Actually, PC is just the enforcement arm of the underlying illness: liberalism. Multiculturalism is the belief system spawned by liberalism that allows their presence here, where is is not appropriate and not wanted by growing numbers of citizens.
We can't change Islam from the outside; they won't change from the inside. The only workable solution is separationism: we stop letting them into the West; we get the ones here to leave, first by carrots, then by sticks; and we don't let them out of their own countries.
Impossible, you say? But the thought of letting our sworn enemies into our lands was unthinkable just a couple of generations ago. Things can change again.

The reason being, of course, that the Koran is fixed, forever, and explicitly states that non-believers are deliberately insulting Mohammed, Allah, and all Moslems by not believing, and are to be subjugated. We may convert or die. In some instances, we may live, but only as dhimmis--third-class citizens with only those rights the Moslems arbitrarily decide we may have.

Why, again, are we letting people who wholeheartedly believe something so antithetical to everything we believe, into our lands?